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* test_003_rabbit_messages was added
*  AMQP client class was refactored to provide utility methods
   via HTTP RabbitMQ API
test_002_rabbit_queues test was refactored to use new AMQP client
test_001_rabbitmqctl_status test has been changed to use new AMQP client
Check for HA configuration was added to the tests
* AMQP client was changed to use RabbitMQ HTTP API
* Tests rabbitmqctl_status and rabbit_queues were updated to
  use the new AMQP client
* All the tests were renamed to specify the execution order
* New test_003_rabbit_messages test was added
* Check that the configuration is HA one was added
* PEP8 issues were fixed